The aerodynamic properties of thick aerofoils suitable for internal bracing (1920)
NASA Technical Reports Server (NTRS) · leaf 20
a minimum when the thickness ratio is SO, and at 14° when it is 60. At low angles the drag is quite regular, but at high angles the points do not lie on a smooth curve. As would be expected, wing No. 43 has abnormally high values of drag above 6°, but below this agrees well with No. 16. Wing No.… … The points on plot 27 are naturally less regular than on the others, but it is evident that the efficiency increases with the thickness ratio between 2° and 8°, but at lower and higher angles it-^occurs at a lower thickness ratio. The efficiency is higher with the thicker wings at 0° only because…
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